The two-seat buggy is the standard: a driver and a passenger side by side. It suits a couple, two friends, or a parent with a child of 6 or over.
The 4-seat buggy (Can-Am 1000 cc) suits a family or a small group that wants to stay in the same vehicle: one driver and up to three passengers, with no minimum number of people. It is an option of both drives, the 1-hour and the 2-hour, chosen in the booking calendar before you confirm. The booking page has two counters, one for 2-seat buggies and one for the 4-seat buggy, and you say how many of your buggies are 4-seaters: six people, for example, take one 4-seater and one 2-seater.
The rules are the same for both: the driver is 18 or over with a driving licence, each passenger is at least 6 years old, and each booking includes at least one adult. The 4-seat option costs 50% more than the two-seat buggy, per vehicle and not per person; the exact price shows in the calendar before you book. There is one limit: Quad Marrakech has four 4-seat buggies per departure, shared by all bookings and by both drives. The counter stops at what is left on the departure you pick, and once the four are taken the other groups on that departure take 2-seat buggies.